The truth about your seltzer habit. By Alison Mango Published March 08, 2016. For anyone who loves fizzy water, picking out a bottle can be a little tricky. Seltzer, sparkling mineral water, club soda—there are so many types, how do you know what’s in what? And are they really as healthy as we think? To find out more about our beloved bubbly, we talked to Atlanta-based nutritionist Marisa Moore, RDN.